gluon - Android back button closes app -

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i'm showing local html file in webview center node of glisten view. when presss android button, instead of going previous view, app gets closed. when use appbar button switch previous view works fine. tried attach event filter both, webview , scene, doesn't triggered.

javafxports version: 8.60.6

update:

the issue occures when webview focused. 

public class importhelppresenter extends basepresenter {      @fxml     private webview web;      @override     protected void initialize() {         super.initialize();         web.setcontextmenuenabled(false);         loadhelppage();     }      private void loadhelppage() {         string htmlcontent = null;         try {             htmlcontent = readcontent("importhelp.html");         } catch (ioexception e) {             e.printstacktrace();         }          web.getengine().loadcontent(htmlcontent);     }      string readcontent(string filename) throws ioexception {         inputstream = getclass().getresourceasstream(filename);          bufferedreader br = new bufferedreader(new inputstreamreader(is));         try {             stringbuilder sb = new stringbuilder();             string line = br.readline();              while (line != null) {                 sb.append(line);                 line = br.readline();             }             return sb.tostring();         } {             br.close();         }     }      eventhandler<? super keyevent> backbuttonfilter = evt -> {         system.out.println(evt);         if (keycode.escape.equals(evt.getcode())) {             evt.consume();             showpreviousview();         }     };      @override     protected void onshown() {         super.onshown();         web.getscene().addeventfilter(keyevent.any, backbuttonfilter);         web.addeventfilter(keyevent.any, backbuttonfilter);     }      @override     protected void onhidden() {         web.getscene().removeeventfilter(keyevent.any, backbuttonfilter);         web.removeeventfilter(keyevent.any, backbuttonfilter);     } }

logcat:

04-19 04:49:54.760: v/internalwebview(11536): webview added viewgroup [x: 0, y: 84 , w: 480 h: 678] 04-19 04:49:54.760: v/internalwebview(11536): loading content: <html> //content omitted 04-19 04:49:54.930: d/webcoreglue(11536): netstack: memory cache feature on 04-19 04:49:55.070: v/chromium(11536): external/chromium/net/host_resolver_helper/host_resolver_helper.cc:66: [0419/044955:info:host_resolver_helper.cc(66)] dnspreresolver::init got hostprovider:0x51d36010 04-19 04:49:55.070: v/chromium(11536): external/chromium/net/base/host_resolver_impl.cc:1510: [0419/044955:info:host_resolver_impl.cc(1510)] hostresolverimpl::setpreresolver preresolver:0x51d25d10 04-19 04:49:55.070: d/hoststatisticmanager(11536): netstack: dns host prioritization is: on, version: 5.0.1 04-19 04:49:55.080: d/(11536): external/chromium/net/socket/tcp_fin_aggregation_factory.cc: libtcpfinaggr.so loaded 04-19 04:49:55.080: d/(11536): external/chromium/net/socket/tcp_fin_aggregation_factory.cc,: tcp fin aggregation initializing method found in libtcpfinaggr.so 04-19 04:49:55.080: d/tcpfinaggregation(11536): netstack: tcpfinaggregation 1, version 5.0.1 04-19 04:49:55.080: d/tcpfinaggregation(11536): system property net.tcp.fin.aggregation.wait set, value: 20 04-19 04:49:55.080: d/tcpfinaggregation(11536): system property net.tcp.fin.aggregation.close set, value: 300 04-19 04:49:55.080: d/tcpfinaggregation(11536): netstack: closeunusedsockets on, (tcpfinaggregation), version 5.0.1 04-19 04:49:55.080: d/tcpfinaggregation(11536): failed network status! received ret: -2 04-19 04:49:55.080: d/socket_pool(11536): netstack: closeunusedsockets on 04-19 04:49:55.080: d/socket_pool(11536): netstack: system net.statistics value: 0 04-19 04:49:55.080: d/socket_pool(11536): netstack: closeunusedsockets on 04-19 04:49:55.080: d/socket_pool(11536): netstack: system net.statistics value: 0 04-19 04:49:55.090: d/(11536): external/chromium/net/http/http_getzip_factory.cc: libgetzip.so loaded 04-19 04:49:55.090: d/(11536): external/chromium/net/http/http_getzip_factory.cc,: getzip initializing method found in libgetzip.so 04-19 04:49:55.090: d/netstack(11536): netstack: request priority on 04-19 04:49:55.090: d/(11536): netstack: getzip is: on, version: 5.0.1 04-19 04:49:55.180: d/webkit(11536): error:  04-19 04:49:55.180: d/webkit(11536): alias gb18030 maps gb18030 already, trying make map gbk 04-19 04:49:55.180: d/webkit(11536): external/webkit/source/webcore/platform/text/textencodingregistry.cpp(152) : void webcore::checkexistingname(char const*, char const*) 04-19 04:50:00.120: e/dalvikvm(11536): gc_concurrent freed 1207k, 24% free 17251k/22599k, paused 5ms+7ms, total 350ms 04-19 04:50:02.810: d/audiomanager(11536): currentdevicetype = 1 04-19 04:50:02.870: v/fxactivity(11536): onpause 04-19 04:50:03.690: w/iinputconnectionwrapper(11536): showstatusicon on inactive inputconnection 04-19 04:50:03.770: v/fxentity(11536): called surface destroyed 04-19 04:50:03.780: v/fxactivity native(11536): [jvdbg] surface created native android window @ 0x0, surface = 0x0 04-19 04:50:03.790: i/glass(11536): native code notified surface has changed (repaintall)! 04-19 04:50:04.210: w/managedeglcontext(11536): doterminate failed: egl count 2 managed count 1 04-19 04:50:04.210: v/fxactivity(11536): onstop 04-19 04:50:04.210: v/fxactivity(11536): ondestroy


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